Zaid Rahman dropped out of Columbia, won a Thiel Fellowship, sold his first startup, and came out the other side with a stubborn observation: the banking industry had built elegant tools for consumers and for venture-backed startups, but it had missed the people who actually own and run the economy.
By the middle of 2026, that observation is carrying a $1.2 billion valuation.
Valuation doubled to $1.2 billion in six months. Annualised revenue tripled since December. Total payment volume crossed $10 billion — 4× year-over-year.
The round funds Flex Global, a cross-border banking layer that puts stablecoin rails under an invisible private-banking interface for high-net-worth business owners in 100+ countries.
There are roughly 350,000 high-net-worth business owners in the United States who collectively account for about 40 percent of private-sector payroll. Globally, the figure is estimated at 3 million. Their financial lives are structurally intertwined — personal guarantees underwrite business credit, operational cash moves through the same accounts as family expenses, and cross-border transactions cut through three to five intermediaries.
Existing banks treat business and personal finance as separate. Flex treats them as one balance sheet.
Two rounds in seven months
Flex closed a $60 million Series B in December 2025. At the time it had tripled payment volume to $3 billion in a single year. Seven months later it raised again — an unusual cadence that reflects how fast the underlying demand is moving.
TIMELINE: Flex
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2023 Dec 2025 Jul 2026 2026 H2 2027
🏁 💰 ◉ NOW 🔥 NEXT 🔭 FUTURE
Founded $60M B $70M B1 Double team Mortgage, travel
Zaid $3B TPV $10B TPV 200+ staff product expansion
Rahman Series B Flex Global
Flex's growth timeline — source: company announcements, Reuters
The Series B1 was led by Halo Fund, a vehicle co-founded by Qualtrics founder Ryan Smith and Accel partner Ryan Sweeney. Portage Ventures, Wellington, Crosslink Capital, 53 Stations, and others joined. Halo's sports-and-entertainment platform — spanning the NBA, NHL, and Formula 1 — gives the company distribution into exactly the audience it needs: founders and owner-operators who sit well outside Silicon Valley but share the same multi-entity, multi-currency financial reality.
What Flex Global actually is
The product launched alongside the round extends its platform past the US border. Under the hood it is a stablecoin settlement layer — but the user never touches a wallet.
An owner paying a supplier in Warsaw pays them the same way they would pay one in Dallas. The money moves in minutes, not days, through a private-banking interface that hides the blockchain plumbing entirely.
Flex Global includes stablecoin rails and wallets in more than 100 countries, institutional USD accounts for foreign business owners, multi-currency accounts across 76 countries supporting 32 currencies, and private credit in over 20 countries. Cards are issued across entities and geographies on a single platform.
The average customer now uses four or more products. The three largest business categories by logo count are construction, wholesale, and multinational businesses — each of them structurally dependent on cross-border flows that legacy banking handles poorly.
Why now
The company's timing tracks a deeper infrastructure shift. Stablecoin legislation matured in both the US and Europe over the past eighteen months. Major payment networks moved settlement pilots into production. Visa's stablecoin settlement reached a $7 billion annualised run rate in April. Mastercard's $1.8 billion acquisition of BVNK in mid-2026 was the clearest signal yet that the technology had graduated from pilot to plumbing.
Real-economy stablecoin payment volume roughly doubled in 2025 to about $390 billion, according to McKinsey and Artemis research, with the bulk of it business-to-business. Flex is riding that wave — but with a crucial differentiation: it abstracts the rail away so the customer never knows it is there.
The company's Beacon AI agentic finance system sits on top of the stack, helping owners manage decisions across their full balance sheet. Over time it plans to expand into mortgages, travel products, and rewards cards, turning the platform into a full-spectrum private bank.
What it means for private banking
The private banking market was valued at $505 billion in 2025 and is projected to reach $721 billion by 2030, per Research and Markets. But nearly all of that growth is concentrated at the top — institutions serving billion-dollar families and sovereign wealth. The middle-market owner, generating nine-figure revenue across three currencies and two continents, sits in a structural blind spot that traditional private banks have never bothered to address.
Flex is not the only company trying to fill the gap. France-based RockFi is building a stablecoin-native private bank with more conservative growth metrics. Mercury raised $200 million at a $5.2 billion valuation in early 2026 and is pursuing a national bank charter. But its product breadth — credit, banking, payments, treasury, and agentic back-office AI under one roof — is wider than any single competitor's, and its pace of capital absorption suggests investors are betting that breadth matters more than depth in this segment.
The risk is execution speed.
It doubled its headcount plans alongside the round — from 110 to over 200 by year-end — and is entering geographies with divergent regulatory regimes. Rapid geographic expansion combined with aggressive hiring is the pattern that has broken fintech companies before.
But the underlying thesis is structurally sound: 3 million globally distributed, capital-intensive business owners who operate across borders as a default, served by a banking system designed for single-currency, single-entity customers. That gap does not close on its own.
